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NMR Imaging apparatus of changeable inspecting zone size

  • US 4,558,425 A
  • Filed: 09/01/1982
  • Issued: 12/10/1985
  • Est. Priority Date: 09/04/1981
  • Status: Expired due to Term
First Claim
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1. An imaging apparatus using nuclear magnetic resonance, comprising:

  • field generation means for generating a static magnetic field, a linear gradient magnetic field and a radio frequency magnetic field, respectively, and for exciting nuclear spins in an object to be inspected so as to produce a nuclear magnetic resonant signal when said object is located in a magnetic field having a predetermined spatial gradient;

    signal detection means for detecting the nuclear magnetic resonant signal which is indicative of a projection of a nuclear spin distribution in said object to be inspected;

    a computer responsive to said signal detection means for calculating an imaging signal;

    output means for displaying the imaging signal from said computer; and

    control signal generation means for generating a control signal for controlling the intensity of said linear gradient magnetic field, said control signal having a value indicative of the size of said object to be inspected;

    said linear gradient magnetic field generation means being responsive to said control signal generation means for providing said predetermined spatial gradient corresponding to said control signal.

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